Andreas Lubitz told former girlfriend he was planning an act so horrifying his name would be remembered forever He was a master of hiding his darkest thoughts and frightened his former lover so much she decided to leave him Startling revelations add weight to claims the pilot concealed medical condition that should have stopped him flying Comes after it emerged Lubitz should have been off sick on day he deliberately crashed plane into mountainside Torn-up sick notes have been found in 27-year-old's flat which showed he had hidden extent of illness from airline